Jim Meyering wrote: > diff --git a/tests/dd/reblock b/tests/dd/reblock > index 542529a..ef9e036 100755 > --- a/tests/dd/reblock > +++ b/tests/dd/reblock > @@ -44,7 +44,10 @@ sed 's/,.*//' err > k && mv k err > compare err exp-reblock || fail=1 > > # Demonstrate that bs=N supersedes even following ibs= and obs= settings. > -(echo x; sleep .1; echo y) | dd bs=3 ibs=1 obs=1 > out 2> err || fail=1 > +# Choosing a delay of 0.1 would result in an occasional lost race where > +# the consumer's first read would consume 3 bytes rather than the expected 2. > +# Not wanting to sleep a full second, I'll raise that to 0.3. > +(printf ab; sleep .3; printf cd) | dd bs=3 ibs=1 obs=1 > out 2> err || fail=1 > sed 's/,.*//' err > k && mv k err > compare err exp-no-reblock || fail=1
Doesn't the same logic need to be applied to both tests in this file, as they both expect 2 short reads? Hmm, I wonder is there a way to get the producer to wait until the consumer is ready. I think both open()s on a fifo block on each other, so the following would cause `printf ab` to happen after dd has executed open(), which might help? mkfifo dd.fifo dd ibs=3 obs=3 if=dd.fifo > out 2> err& (printf ab; sleep .1; printf cd) > dd.fifo wait #for dd to complete sed 's/,.*//' err > k && mv k err compare err exp-no-reblock || fail=1 thanks, Pádraig. _______________________________________________ Bug-coreutils mailing list Bug-coreutils@gnu.org http://lists.gnu.org/mailman/listinfo/bug-coreutils
